400 



Special Reports 



December 1915. Beginning with 1916 the relations adopted by the Director of the 

 Meteorological Service are:' 



(a) I. M.S. at Agincourt pier = Agincourt (Toronto declinometer at pier A) 0'.9. 



(b) I. M. S. at Agincourt pier E = Agincourt (Elliott magnetometer No. 98 at pier E) + 



0.00039/Y. c 



(c) I. M. S. at Agincourt pier E = Agincourt (Toepfer inductor No. 89 at pier C) O'.l 5. 



Table ID. Results of Declination Comparisons at the Agincourt Observatory, 1916. 



1 Values for Agincourt standard at pier A obtained from eye readings of magnetograph using base-line as determined 

 by the 10 sets of observations with Toronto declinometer at pier A made simultaneously with magnetometer No. 15 at pier F. 



All values by magnetometer No. 15 referred to pier E since former comparisons between it and Agincourt declinometer 

 were always made with magnetometer No. 15 on this pier, and no allowance was made for station-difference between piers 

 .1 and E; =A+0'.38=F-0'.24. 



3 For this series magnetometer No. 15 was mounted on pier A as close as possible to the Observatory declinometer, 

 and simultaneous readings were taken on the magnetograph. Observers were: magnetometer No. 15, W. E. W. Jackson; 

 magnetograph, W. Menzies. 



Observers were: magnetometer No. 15, W. E. W. Jackson: magnetograph, W. Menzies. 



Observers were: magnetometer No. 15, W. E. W. Jackson; declinometer, W. Menzies; magnetograph, A. R. O. 

 Wakely. 



" Thus the published values for declination and horizontal intensity would apply for pier E, while the inclination 

 wouid apply for pier C upon which the inductor is mounted; presumably the station-difference in inclination between piers 

 C and E is negligible. 



6 See "Results of Observations at the Canadian Magnetical Observatoiies Agincourt and Meanook for the Year 1916," 

 by W. E. W. Jackson, Ottawa, 1919, pp. 3-8. 



'This correction does not quite agree with that determined in formula (i) below because of error in mean value for 

 (Agincourt M. S. 15), which is given as 5.I7 (or - 0.00032//) on page 6 of the reference cited in foot-note 2 above instead 

 of -5.6-, (or -0.00035//). 



